How to create default json object from json schema in c#

Question

I can not google that thing on json.net api reference or anywhere. I want to create object from json schema with default values filled in. Basically some thing like this:

var JsonSchema=JsonSchema.ReadSchemaFromSomeWhere();
dynamic DefaultObject= JsonSchema.GetDefaultObject();

Example you might see in json-schema-defaults package.

Example

var JsonSchema=JsonSchema.ReadSchemaFromString("
{
  "title": "Album Options",
  "type": "object",
  "properties": {
    "sort": {
      "type": "string",
      "default": "id"
    },
    "per_page": {
      "default": 30,
      "type": "integer"
    }
  }");

dynamic DefaultObject= JsonSchema.GetDefaultObject();

//DefaultObject dump is
{
  sort: 'id',
  per_page: 30
}

UPDATE

I want lib or api in json.net to create object with default values from any given valid json schema during runtime.

@Marty since schema might be arbitrary i would think that it can be create like dynamic object or i dont know Jobject instance or whatever even string, or what s your question ? — Kostia Mololkin
– Kostia Mololkin, Commented Mar 9, 2016 at 20:06

Marty · Accepted Answer · 2016-03-09 20:55:35Z

1

Well a simple case might be this

[Test]
public void Test()
{
   dynamic ob = new JsonObject();
   ob["test"] = 3;

   Assert.That(ob.test, Is.EqualTo(3));

}

I used the RestSharp library that provides a good dynamic implementation that allows indexing ["test"];

So then - what You're left to do is read the properties from the schema and assign values (of course this will work only for simple plain case`s, but might be a start

dynamic ob = new JsonObject();
foreach (var prop in JsonSchema.Properties)
{

   if (prop.Default != null)
      ob[prop.Name] = prop.Default
}

edited Mar 9, 2016 at 20:55

answered Mar 9, 2016 at 20:11

Marty

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10 Comments

Kostia Mololkin Over a year ago

no , my intent is not get c# class code in order to compile, i want in runtime on any given vaiild json schema produce json object from it with default values, so im looking for lib or api in json.net, i will update my question to make it clear sorry

Marty Over a year ago

what would the defaults be ? a dynamic object, with props from schema set to NULL values ?

Kostia Mololkin Over a year ago

null in case schema not specified default value for property , if it specified default value then it should be there , check node package from reference in question ,it does what i want in javascript

Marty Over a year ago

yep, working on it. seems that there is no out of the box solution. at least from NewtonSoft

Kostia Mololkin Over a year ago

thanks for looking into it!, i checked source code of js lib - seems not too big, and might be rewritten in c# but still:)

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